About 2000 years ago, according to legend, while snow was falling on a clear, freezing night on earth, a fierce devil prince was born deep in the darkest pit of the netherworld.
Within a short time he gained his full powers and took over the Devil Throne. His first act as ruler of all the devils was to declaer himself emperor of the Devil Kingdom.His next feat was an invasion of the human world.His plan was to conquer it and rule as potentate over both the lower and the upper realms. But powerful Devil-knight known as Dr.Rikku took pity on humans for their brief, transient lives. Leading a rebel force, he defeated all the Devil ruler's armies and finally imprisoned the emperor himself in a seal vault.
Having achieved his victory, Dr.Rikku abandoned the Devil Kingdom to live in the human world. He married a human wonman and soon fathered a half devil, half human son. But beware, mankind. After 2000 years, the cused Devil Emperor will be released and will return to invade the human world once again. Dr. Rikku must be our protector.